Christ in greek is (Christos; chi-rho-iota-sigma-tau-omicron-sigma).
About the Chi Rho Symbol
The Chi Rho symbol is generally depicted as the Greek letter chi (which looks like the Roman alphabet X) superimposed over the elongated stem of the Greek letter rho (which looks like the Roman alphabet P). It is a Christian symbol representing Jesus Christ, with the chi and rho being the first two letters in the Greek spelling of Christ (Christos; chi-rho-iota-sigma-tau-omicron-sigma).
The Chi Rho symbol is also called the labarum, the Monogram of Christ, Constantine's Cross, the Chrismon, the Christogram, and the Monogram of Constantine. The Chi Rho symbol was used to represent Jesus even before 312 AD. However, in 312 AD, the Roman Emperor Constantine I was said to have had a vision or a dream of the Chi Rho symbol in the sky in which were emblazoned the Greek words 'en touto Nika' (translated in Latin into 'In Hoc Signo Vinces' and in English into "In this sign (the cross) you will conquer." Some believe that the arrangement of stars in the night sky of 27 October 312 formed the Chi Rho. In any event, Constantine I had his troops' shields emblazoned with this symbol and created his own standard with the Chi Rho and the 'en touto Nika' as prominent symbols. Constantine I, although outmanned, defeated his enemy and became sole emperor of the Roman Empire.
Constantine I then converted to Christianity, becoming the first Roman Emperor to do so. Christians were now free to practice their faith, and Constantine I and his mother encouraged the Christians. Constantine I and his mother were sainted by the Catholic Church.
To this day, the Chi Rho symbol is used to represent Jesus Christ.